/*
 * Copyright � 2002-2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System.Collections;
using Spring.Util;

namespace Spring.Expressions.Processors;

/// <summary>
/// Implementation of the minimum aggregator.
/// </summary>
/// <author>Aleksandar Seovic</author>
public class MinAggregator : ICollectionProcessor
{
    /// <summary>
    /// Returns the smallest item in the source collection.
    /// </summary>
    /// <param name="source">
    /// The source collection to process.
    /// </param>
    /// <param name="args">
    /// Ignored.
    /// </param>
    /// <returns>
    /// The smallest item in the source collection.
    /// </returns>
    public object Process(ICollection source, object[] args)
    {
        object minItem = null;
        foreach (object item in source)
        {
            if ((minItem == null && item != null) || (CompareUtils.Compare(minItem, item) > 0))
            {
                minItem = item;
            }
        }

        return minItem;
    }
}